After her father has been murdered, the beautiful but allegedly insane Isabella lives in the house of her two nephews. A scenarist in need of inspiration walks on the beach and slowly unravels a series of murders.
| Actor | Role |
|---|---|
 Rossana PodestàIsabella | Isabella |
 Carlos López MoctezumaNot listed | Not listed |
 Marco VicarioNot listed | Not listed |
 Fernando ReyNot listed | Not listed |
 Alfredo MayoNot listed | Not listed |
 José NietoNot listed | Not listed |
 Santiago RiveroNot listed | Not listed |
| EEtelberto Franco-QuirinoNot listed | Not listed |